Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473c7b1c76fe75e5f6a6de7a67deff4aca080d44cd47cc0dcce4465d151b12bf' 
  AND token = '1wy1KnqUcrbVx0CWwMihkp7qxlNPQSTpsKonCDqJmgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}